Drafting implement.



B. ROMAN.

DRAFTING IMPLEMENT.

APPLICATION FILED AUG. 1. 1907.

Patented. Aug. 2, 1910.

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DEAFTING IMPLEMENT.

' APPLICATION FILED AUG. 1. 1907. ggg 45 Patented Aug. 2, 1910.

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an eras harass? oration.

JAMIE near, 015 NEW YQEK, N. E.

DBAFTIHG" IMPLEMENT.

senses.

specification 015 Letters Patent.

Patented Aug. 2, thin dipplication film August ll, 1%7. finial Ito. 345%,51553.

To all when it may concern:

Be it known that E, BnNJAMrN Roman, residing in the city of New York, borough of Manhattan, county and: State of New York, have invented certain new and useful Em rovements in limiting implements, of which the fol-lowing is a in 1, clear, and exact specifieatiom, I

This invention relates to drafting implemerits.

Tihe' object of the invention is to provide such implements with simple and eficient means tor rapidly drawing dotted lines and Width the foregoing and other ohjects in view, which will appear as the description proceeds, the. invention resides in the combination and arrangement cit parts and in the details oi construction hereinafter described and claimed, it heing understood that changes in the recise em-hodiment oi invention herein disclosed can be made within the scope of the claims without departing from the spirit of the invention.

a In the accompanying drawing, Figure 1 is a plan view, partly broken away, through a drafting implement provided with the improvements of the resent invention. Fig. 2 is a section the ins iii-g oi 1. Fig. 3;- is a section on the line We oi Fig. 1. i is a detail view. Fi his a section on an enlarged scale on the line 0-6 of Fig. 1. Fig. 6 is a section onan enlargedscale on the line w-7 of Fig. Fig. 7 is a view,

partly in elevation andpartly in section,

illustrating a modified construction. Fig. 8

is a plan view showing the improvements applied to a triangle.

Like reference numerals indicate corresponding parts in the,difierent figures oi the drawing.

Z;he dotted line attachment oi the present invention can be applied to almost any style of drafting implement. In Fig. 1, tor example, the attachment is shown as applied to an ordinary form of T-square comprising a lolade 1 having a ruling edge and'a crosspiece or head 2. As shown in Fig. 2, the lade 1 is formed in one face thereof with a recess 3, in which is slidably mounted a plate a. The plate 4% is formed along its front edge with teeth or separated arms 5, which preferably are tapered in form, as shown. The plate 4 is formed of any suitable material, such for example, as brass, and is slidably mounted in the recess in any through the blade 1.

suitable manner. For example, as shown in Figs. 3 and 4, one portion of the plate 4: is struck or hulged upward, as indicated at 6, and is provided with a longitudinal slot 7 The bulged portion 6 slides in a groove 8 formed in the blade 1 of the i -square. @ne or more bolts or rivets 9' are secured to the blade 1 and extend through the slot 7 of the plate a, as shown clearly in Fig. 3, the enlarged head or each riveti) being located within the bulged portion 6 of the plate a. When the plate a is drawn; outward as shown in Fig. 1, so as to expose the separated arms 5 along the straight edge of the lolade 1, a pencan be drawn along said separated arms so as to roduce a dotted ink line in a re id and eficient manner. By reason of the act that the separated arms 5 are tapered or gradually decreased in width from their inner to their outer ends, dotted lines of difierent characters can he produced. For instance, it the plate a be ad'usted outward a considerable distance, so t at the pen will run. along the broad, inner ends of the separated arms 5-, the dotted line will consist of short dots separated by comparatively long spaces, and if the plate 4.- he adjusted inward, so that merely the narrow, outer ends of the separated arms 5 are exposed, the dotted line which will he produced will have comparatively long dashes, separated by short spaces.

When ink is employed, the separated arms 5 should he peculiarly formed in order to prevent smears when the dotted line is drawn and when the drafting implement is moved away from the dotted line. For this reason the separated arms 5, as shown in the enlarged section (Fig. 6), are under-cut or beveled and concaved, as indicated at 15. The path of the pen, in moving over the separated arms 5, is indicated by the dotted lines in- Fig. 6, in which 10 represents a sheet of paper being drawn upon. it will be seen I that no ortions of the separated arms 5 will be sufficlentlynear to the ink lines to cause smearing. The tapered form of said arms 5, as shown in Fig. 1, also serves, in conjunction with the under-cut faces 15, to prevent smearing of the ink line when the instrument is moved away from the line, as Wlll be readily understood.

For the purpose of drawing dotted lines with a pencil, a longitudinal slot 16 is cut This slot 16, as shown in Fig. 2, opens into a recess 17, in which is 1 and 5. The plate 18 is slidably connected with the blade 1 in the same manner as the plate 4:. 'In View of the fact, however, that 1n using a pencil there is no danger of producing smears or blots, the upper surfaces of the separated arms 19, as shown in Fig. 5, are curved, or, in other words, said arms are approximately crescent or bow-shaped in cross-section, whereby the lead pencil will slide easily over said arms in the operation of producing a dotted line, a pencil being indicated by dotted lines in Fig. 5. The plate 18 can be adjusted with respect to the slot 16 so as to produce dotted lines of different character. In the modification illustrated in Fig. 7 two cross-pieces 2 and 2 are connected with opposite sides of the blade 1 to produce an ordinary reversible T-square. Furthermore, the plate 18 is mounted on one side of the blade 1, and the plate 4 is mounted on the other side thereof. In this construction either side of the blade 1 can be placed against the pa er and either the front or rear edge of sai blade can be used as an ordinary straight edge. The details are otherwise the same as illustrated in Fig. 1.

In the modified construction illustrated in Fig. 8, the triangular drafting implement described. The drafting erably is formed of xylonite or s' parent material.

preferably is formed of xylomte or other transparent material, and is provided with.

grooves 30 parallel with the difierent edges thereof. Extending across each of the grooves 30 is a plurality of separated arms 31 for producing dotted lines in the manner implement shown in Fig. 1 can be made 0 any suitable material. Some ink will adhere to the teeth in the course of time; by reason of the fact that the slot 7 in the bulged portion 6 is openended, however, the entire plate 4 can be removed and cleaned whenever it becomes dirty with ink. The plate 18 1 prefar trans- As shown in the modification shown by Fig. 8, the separated arms can be madeintegral with the drafting implement. If it be desired to produce curved, fancy or scroll shaped dotte lines, the implement will be given any desired shape without departing rom the spirit of theinvention.

In Fig. 8 a sliding plate 4 is employed, which is adapted to he slid or adjusted from the slot 30 to the outer edge of the triangle, so that a single set of separated arms can be used for the slot 30 and the outer edge of the implement, as will be understood.

The improvements of the present invention are strong, sim 1e, and inexpensive in construction, as wel as thoroughly efficient in operation.

What is claimed is:

1.- A drafting implement of the character set forth, having a ruling edge, and tapered arms mounted adjacent to and adjustable 'cut tapered arms mounted a 'acent to and adjustable transversely of sai ruling edge 1for use in drawing different kinds of dotted mes.

4. A drafting implement having a slot and ta ered arms extending across said slot and a justable across said slot, for use in drawing diiferent kinds of dotted lines.

5. A drafting implement havin a recess, a plate mounted in said recess an having a bu ged slotted portion extending upward into the drafting implement, means slidably connecting said bulged slotted portion with said drafting implement, and tapered, undercut arms connected with said. plate, for use in drawing dotted lines substantially as described.

In testimony whereof, I have hereunto set my hand in the presence of two subscribing witnesses.

BENJAWN ROMAN. 

